Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
A subtle decrease in the average high-temperature marks December, falling from November's chilly 47.5°F (8.6°C) to an icy 36.7°F (2.6°C). Decatur records an average low of 27.1°F (-2.7°C) throughout the nights in December.Humidity
In Decatur, the average relative humidity in December is 82%.Rainfall
In Decatur, in December, it is raining for 11.1 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, there are 159.4 rainfall days, and 23.74" (603mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 10 days. Throughout December, 1.93" (49mm) of snow is accumulated. Throughout the year, there are 48.4 snowfall days, and 10.47" (266mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:45 am and sunset at 5:12 pm. On the last day of December, sunrise is at 8:03 am and sunset at 5:22 pm EST.
Sunshine
The average sunshine in December is 3.9h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In December, a daily UV index of 1 turns into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Decatur have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Decatur, IN
- Average high temperature in December: 36.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 27.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Decatur, IN
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Decatur, IN
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Decatur, IN
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Decatur, IN
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in December
Decatur, IN
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (7.5 days).
Average snowfall in December
Decatur, IN
- Average snowfall in December: 1.93"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Decatur, IN
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (13.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Decatur, IN
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Decatur, IN
- Average sunshine days in December: 13 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Decatur, IN
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Decatur, IN
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in December
Decatur, IN
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
Decatur, Indiana, USA
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